Ethyl 2-(chloromethyl)-6-(difluoromethyl)-5-methoxypyridine-3-carboxylate
Ethyl 2-(chloromethyl)-6-(difluoromethyl)-3-methoxypyridine-5-carboxylate
Ethyl 6-(chloromethyl)-3-(difluoromethyl)-2-methoxypyridine-4-carboxylate
Ethyl 2-(chloromethyl)-4-(difluoromethyl)-6-methoxypyridine-3-carboxylate